WordPress Stats

Hello,
I’m looking for a wordpress plugin that will show who is logged in and how many guests there are that are not logged in. Something like this:
There are 2 user(s) logged in.
There are 5 guest(s) not logged in.
Then, What i would do is include the file inside my wp-sidebar.php (1.3). 🙂
Thanks alot,
XeroCool